Still being careful, and doing some proper planning of route and quest order, I got to the last quest (servants of grenth) right at the 2 hour mark. Dhuum is a bit of a marathon, so my last essence ran out (30 mins) before SoG and dhuum were both finished. Then again, I. Take dhuum as slowly as possible to make sure to finish him off. My first successful 7 hero run ended prematurely at dhuum because I did too much damage to him before the dhuum's rest bar filled up, and a bug causes you to sometimes be kicked from uw (disconnected) and unable to resume your spot.